document.write( "Question 595092: find the value of c that makes each trinomial a perfect square: x^2-21x+c. \n" ); document.write( "
Algebra.Com's Answer #377128 by ankor@dixie-net.com(22740)\"\" \"About 
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find the value of c that makes each trinomial a perfect square: x^2-21x+c.
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\n" ); document.write( "Divide the coefficient of x by 2, and square it
\n" ); document.write( " -21/2 = -10.5; -10.5^2 = +110.25 = c
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\n" ); document.write( "x^2 - 21x + 110.25
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